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2.
Int Nurs Rev ; 58(2): 225-33, 2011 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-21554297

RESUMEN

AIM: To examine the roles of nurses in general practice interdisciplinary teams caring for people with mild to moderate mental health conditions. BACKGROUND: Supporting mental health and well-being is an important aspect of primary care. Until now nurses in general practice settings have had variable roles in providing mental health care. The New Zealand Primary Mental Health Initiatives are 26 government-funded, time-limited projects using different service delivery models. METHODS: An analysis was undertaken of a qualitative data set of interviews, which included commentary about nurses mental health work collected from the different project stakeholders throughout a 29-month external evaluation. FINDINGS: Two main groups of roles for nurses within the general practice interdisciplinary team were identified: specialist mental health nurses working in newly created roles and practice nurses working in existing roles. Barriers exist to the development of the latter roles. CONCLUSIONS: Mental health care is a key role in general practice as this is where people frequently present. Internationally, nurses represent a large workforce with the potential to provide effective mental health care. This study found that attitudinal, structural and professional barriers are restricting New Zealand practice nurse role development in the care of those with mild to moderate mental health conditions. There is potential to develop their role within a structured pathway by workforce development and recognition of the value of interdisciplinary care. Given the shortage of mental health professionals this will be an important aspect of the improvement of primary mental health care.


Asunto(s)
Medicina General , Trastornos Mentales/enfermería , Rol de la Enfermera , Enfermería de Atención Primaria , Vías Clínicas , Humanos , Nueva Zelanda , Enfermería Psiquiátrica
3.
Pac Health Dialog ; 8(1): 163-5, 2001 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-12017818

RESUMEN

Maori are the indigenous people of New Zealand who in total make up 14.5% of the population. Although this group has a significantly lower life expectancy than non-Maori, coupled with increased rates of mortality and morbidity, very little is known about the menopausal health needs of older Maori women. As the first step in addressing the health needs of this group, older Maori women's definitions, attitudes, symptoms, expectations and health needs at menopause need to be identified and described. The study Nga Ruahine or "Maori in Menopause" is the foundation study of the Aotearoa Women's Health Initiative (AWHI). AWHI is a women's health programme being developed by the Wellington School of Medicine, which involves a suite of studies. The objective is to describe the journey of older Maori women through menopause and beyond and to compare and contrast the experience of Maori women from both traditional and contemporary upbringings, with reference to the Pakeha (European) population. It is hoped that this work could lead to further studies such as, for example, a longitudinal observational study looking at older New Zealand women. The potential significance of this approach is discussed.


Asunto(s)
Actitud Frente a la Salud/etnología , Menopausia/etnología , Salud de la Mujer , Factores de Edad , Femenino , Humanos , Persona de Mediana Edad , Nativos de Hawái y Otras Islas del Pacífico , Evaluación de Necesidades , Nueva Zelanda
4.
Br J Orthod ; 25(3): 181-5, 1998 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-9800015

RESUMEN

This study examined the dento-alveolar relationships of 5-year-old children born with a unilateral cleft lip and palate with primary surgical repair performed in one of two centres (Bristol or Oslo). The Bristol sample comprised 46 sets of study models and the Oslo CLP Growth Archive provided 54 cases with a very similar sex distribution. We used a recently developed 5-year-old index to measure differences in outcome between the two centres. The Oslo sample were assessed as having up to 57 per cent in the ideal groupings (1 and 2), in the Bristol group this was only 35 per cent. Bristol had up to 46 per cent of cases assessed in the worst groups (4 and 5). The comparative figure from the Oslo group was 15 per cent. These results suggest that it is possible to detect differences in surgical outcome at 5 years of age.


Asunto(s)
Labio Leporino/cirugía , Fisura del Paladar/cirugía , Factores de Edad , Estudios de Casos y Controles , Preescolar , Labio Leporino/patología , Fisura del Paladar/patología , Arco Dental/anatomía & histología , Oclusión Dental , Inglaterra , Femenino , Humanos , Masculino , Modelos Dentales , Variaciones Dependientes del Observador , Reproducibilidad de los Resultados , Suecia , Diente Primario , Resultado del Tratamiento
5.
Cleft Palate Craniofac J ; 34(3): 226-31, 1997 May.
Artículo en Inglés | MEDLINE | ID: mdl-9167073

RESUMEN

OBJECTIVE: This study examined the satisfaction of patients with clefting and their parents with facial appearance and how this alters with age. The relationship between satisfaction with appearance and psychosocial functioning was also examined. DESIGN: Prospective SETTING: Subjects were recruited for the study from nine hospital-based clinics. PARENTS, PARTICIPANTS: All subjects has some type of cleft and were 10, 15 or 20 years of age. In all, 111 subjects with clefting and 62 parents were included. MAIN OUTCOME MEASURES: Facial appearance was rated on a subjective ordinal scale of 1 to 7; psychosocial adjustment was measured with the Childhood Experience Questionnaire. RESULTS: Self-satisfaction with appearance among the 10- and 15-year-old subjects correlated with their psychosocial adjustment (p = .027). The 20-year-old subjects were, on average, significantly more satisfied with their appearance than the 10- and 15-year-olds (p = .009 and p = .012, respectively). However, some 20-year-old subjects remained greatly dissatisfied with aspects of their facial appearance. Subjects with visible anomalies were significantly more dissatisfied with their appearance than subjects with invisible anomalies (p = .035). The 15-year-old subjects were identified as being significantly more dissatisfied with appearance than their parents (p = .005). CONCLUSIONS: Subjects affected by a cleft with visible impairments are more dissatisfied with their facial appearance than are subjects with invisible impairments. Satisfaction with facial appearance among 10- and 15-year-old subjects with a cleft may be associated with their self-reported levels of psychosocial functioning. Measuring self-satisfaction with appearance may help to identify subjects at risk from adjustment problems.


Asunto(s)
Labio Leporino/psicología , Fisura del Paladar/psicología , Autoimagen , Adaptación Psicológica , Adolescente , Adulto , Niño , Estudios Transversales , Humanos , Padres/psicología , Satisfacción del Paciente , Estudios Prospectivos , Psicometría , Ajuste Social
6.
Cleft Palate Craniofac J ; 34(3): 242-6, 1997 May.
Artículo en Inglés | MEDLINE | ID: mdl-9167076

RESUMEN

OBJECTIVE: This study assessed the reproducibility, reliability, and predictive validity of a previously developed index by the authors for assessing surgical outcome in unilateral cleft lip and palate (UCLP) children aged 5. METHODS: Sixty randomly selected study models of 5- to 6-year-old complete UCLP subjects were obtained and the index was used to assess their surgical outcomes. RESULTS: Assessment of these study models using the new index demonstrated excellent intra-examiner agreement. The inter-examiner agreement was shown to be good. The corresponding longitudinal models at 16 to 18 years of 54 of the initial 5- to 6-year-old sample were also acquired. These subjects had undergone orthodontic treatment but not orthognathic surgery. The need for osteotomy amongst these models was assessed. Between 13% and 18% (depending on examiner) of 5-year-olds' models were scored in the groups likely to require orthognathic surgery. In the corresponding 16- to 18-year-olds' models, 9% were assessed as likely to benefit from an osteotomy. However, on an individual basis, it was not possible to predict future growth from study models at age 5. CONCLUSIONS: This study has provided a reliable and reproducible index for assessing the outcome of surgery in UCLP subjects earlier than indices already available. True validation of the index was not possible but it appears that it relies on face validity.


Asunto(s)
Labio Leporino/cirugía , Fisura del Paladar/cirugía , Desarrollo Maxilofacial , Evaluación de Resultado en la Atención de Salud , Cirugía Bucal/normas , Adolescente , Niño , Preescolar , Femenino , Predicción , Humanos , Registro de la Relación Maxilomandibular , Estudios Longitudinales , Masculino , Modelos Dentales , Variaciones Dependientes del Observador , Pronóstico , Valores de Referencia , Reproducibilidad de los Resultados
7.
Br J Plast Surg ; 50(1): 1-9, 1997 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-9038507

RESUMEN

Our aims were to determine the psychological status of a sample of cleft lip and palate patients and their parents using standardised interviews and to assess subjects' satisfaction with cleft treatment. In all, 242 interviews of 112 patients and 130 parents were carried out in nine base hospitals used for cleft treatment. 73% (n = 38) of 15- and 20-year-old subjects felt their self-confidence had been very much affected as a result of their cleft. 60% of all 112 interviewed patients were teased about speech or cleft related features. A significant minority of 15-year-old subjects (23%, n = 7) felt excluded from treatment planning decisions. Despite high levels of overall satisfaction with cleft care, 60% (n = 78) of parents and 37% (n = 41) of interviewed patients made suggestions for improvements. No agreement between parent/child pairs for their satisfaction with clinical outcome of cleft related features was found using the weighted kappa statistic to determine the level of agreement. Differences between parents' and their child's satisfaction ratings for cleft related features were not statistically significant except for the ratings for 'lip' (P < 0.005) and 'teeth' (P < 0.05) for 15-year-old subjects (Wilcoxon signed rank sum test). Patients' views on planned treatment should therefore be independently sought from their parents' views, as no agreement was found within the groups for perceived satisfaction with clinical outcome. This study demonstrates the importance of identifying 'psychological outcome' as well as 'clinical outcome' in order to improve rehabilitation for cleft lip and palate patients. Seven families were referred for counselling for cleft-associated emotional problems as a result of this survey.


Asunto(s)
Labio Leporino/psicología , Fisura del Paladar/psicología , Satisfacción del Paciente , Adolescente , Adulto , Niño , Preescolar , Labio Leporino/rehabilitación , Labio Leporino/cirugía , Fisura del Paladar/rehabilitación , Fisura del Paladar/cirugía , Femenino , Humanos , Lactante , Recién Nacido , Relaciones Interpersonales , Masculino , Padres/psicología , Participación del Paciente , Relaciones Profesional-Familia , Autoimagen , Encuestas y Cuestionarios , Resultado del Tratamiento
8.
Vaccine ; 14(16): 1531-7, 1996 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-9014295

RESUMEN

Elderly individuals often exhibit a poorer immune response and shorter duration of immunity to vaccines than younger persons. Improvement in vaccine response has been demonstrated when administering the hormone dehydroepiandrosterone sulfate (DHEAS) as an adjuvant in animal trials. Two separate, randomized double-blinded vaccine trials were therefore conducted using DHEAS as an oral adjuvant in individuals age 65 or older. Sixty-six individuals were randomized to DHEAS, 50 mg po bid for 4 days, or a placebo capsule. Tetanus vaccination was given immediately before the fifth dose. At entry the level of protective antibody was age-dependent (P = 0.009), and by 28 days post-vaccination most individuals had protective levels of antibody, with no difference noted between treatment groups. In the second study, 67 individuals received placebo capsules or DHEAS immediately before and 24 h after influenza vaccination. The number of individuals who developed protective titers (> or = 1:40) was not different in the two groups. The mean log increase in HAI response was greater in the DHEAS group to all three vaccine components, although this did not achieve significance. Minimal side-effects of DHEAS administration were noted. Given the trend toward improved response in the elderly to influenza, larger trials using DHEA as an adjuvant in vaccines that are neoantigens may be indicated.


Asunto(s)
Adyuvantes Inmunológicos/administración & dosificación , Sulfato de Deshidroepiandrosterona/inmunología , Vacunas contra la Influenza/inmunología , Toxoide Tetánico/inmunología , Administración Oral , Anciano , Anciano de 80 o más Años , Anticuerpos Antibacterianos/biosíntesis , Anticuerpos Antibacterianos/sangre , Anticuerpos Antivirales/biosíntesis , Anticuerpos Antivirales/sangre , Sulfato de Deshidroepiandrosterona/administración & dosificación , Sulfato de Deshidroepiandrosterona/sangre , Método Doble Ciego , Femenino , Humanos , Vacunas contra la Influenza/efectos adversos , Masculino , Toxoide Tetánico/efectos adversos
9.
Ann N Y Acad Sci ; 774: 232-48, 1995 Dec 29.
Artículo en Inglés | MEDLINE | ID: mdl-8597462

RESUMEN

We have demonstrated that in aged mice, the titer of serum antibody induced against tetanus toxoid correlates with resistance to local paralysis caused by injection of tetanus toxin. Only mice immunized shortly after oral dosing with DHEAS demonstrated high serum antibody titers and complete protection from paralysis. These results became the basis for initiating proof-of-principle studies in human volunteers above age 65 using a licensed influenza vaccine and tetanus toxoid in two independent studies. The use of an oral delivery form of DHEAS before influenza vaccination was associated with a demonstrable increase in the number of individuals with a fourfold increase in HAI titers following vaccination. The overall mean increase in HAI titers was highest in the DHEAS-treated group. The use of DHEAS in the immunization of elderly subjects against tetanus toxoid, while unable to enhance the responses, was not a detriment to antibody response. We conclude that further studies will justify the use of DHEAS as an adjuvant for antigens that represent primary responses in the elderly.


Asunto(s)
Adyuvantes Inmunológicos , Envejecimiento , Deshidroepiandrosterona/análogos & derivados , Vacunas contra la Influenza/inmunología , Anciano , Animales , Anticuerpos Antivirales/biosíntesis , Deshidroepiandrosterona/administración & dosificación , Sulfato de Deshidroepiandrosterona , Femenino , Humanos , Masculino , Ratones , Toxoide Tetánico/inmunología , Vacunación
10.
Health Trends ; 27(4): 111-4, 1995.
Artículo en Inglés | MEDLINE | ID: mdl-10162320

RESUMEN

The issuing of a prescription is central to any doctor-patient interaction. Prescribing variation exists and remains largely unexplained. There is little documented evidence of the effect of patient ethnicity on prescribing patterns. We carried out a secondary analysis of data from the General Household Surveys to examine the association between being given a prescription and patient ethnicity. After modelling, we found that Pakistanis and Indians were significantly more likely to receive a prescription from their general practitioner at a consultation compared to white and West Indian ethnic groups. In addition, consultation rate explained the different prescribing rates among women and men in the white group only. This study raises further questions of the underlying reasons causing these differences which need answering.


Asunto(s)
Utilización de Medicamentos/estadística & datos numéricos , Etnicidad/estadística & datos numéricos , Medicina Familiar y Comunitaria/estadística & datos numéricos , Adolescente , Adulto , Factores de Edad , Anciano , Niño , Preescolar , Prescripciones de Medicamentos/estadística & datos numéricos , Femenino , Encuestas de Atención de la Salud , Humanos , India/etnología , Lactante , Recién Nacido , Masculino , Persona de Mediana Edad , Pakistán/etnología , Relaciones Médico-Paciente , Pautas de la Práctica en Medicina/estadística & datos numéricos , Reino Unido , Indias Occidentales/etnología , Población Blanca/estadística & datos numéricos
12.
J Exp Med ; 174(6): 1323-33, 1991 Dec 01.
Artículo en Inglés | MEDLINE | ID: mdl-1660523

RESUMEN

Freshly isolated lymph node (LN) cells cultured in serum-containing medium were restricted to produce primarily interleukin 2 (IL-2) subsequent to T cell activation. Only minimal amounts of IL-4, IL-5, or interferon gamma (IFN-gamma) were produced under these conditions. Similar populations of LN cells cultured in serum-free medium were able to produce a variety of lymphokines after T cell activation, with the relative quantities of each species being dependent upon the lymphoid organ source of the lymphocytes. A similar relationship in the patterns of lymphokines produced by activated T cell hybridomas maintained under serum-free conditions was also observed, whereas activation in serum-supplemented media resulted in a predominant restriction to the secretion of IL-2. Additional studies determined that the entity in serum responsible for restricting T cell function in vitro was platelet-derived growth factor (PDGF). The PDGF-BB isoform was established to be the most active in the regulation of T cell function, enhancing IL-2 while depressing the production of IL-4, IL-5, and IFN-gamma at concentrations below 1 ng/ml. PDGF-AB was also found to be quite active, however, this isoform of PDGF was incapable of influencing IFN-gamma production at the concentrations tested. PDGF-AA was very weakly active. It therefore appears that PDGF, acting primarily through a beta receptor subunit (either alpha/beta- or beta/beta-type receptors) is able to influence profoundly the behavior of T cells, with some of its modulatory effects exhibiting isoform specificity. This is reflected by an enhancement in the production of IL-2, while simultaneously depressing the secretion of IL-4, IL-5, and IFN-gamma (PDGF-BB only) after T cell activation. Kinetic studies, where cell supernatants were analyzed both 24 and 48 h after T cell activation, suggested that "desensitization" to PDGF influences can occur naturally in vitro. Those species of lymphokines that were inhibited by PDGF over the first 24 h after activation could be produced at normal levels over the subsequent 24-h period. Finally, lymphokines maintained in the presence of PDGF-BB for greater than 24 h before their activation lost sensitivity to this growth factor. These cells regained responsiveness to PDGF after an additional incubation period in PDGF-free medium. Collectively, our data imply that the pattern of T cell lymphokines produced, plus the kinetics of their production after activation, are being controlled by the potent serum growth factor PDGF.(ABSTRACT TRUNCATED AT 400 WORDS)


Asunto(s)
Factores Inmunológicos/farmacología , Factor de Crecimiento Derivado de Plaquetas/farmacología , Linfocitos T/efectos de los fármacos , Animales , Fenómenos Fisiológicos Sanguíneos , Células Cultivadas , Femenino , Activación de Linfocitos/efectos de los fármacos , Linfocinas/biosíntesis , Masculino , Ratones , Ratones Endogámicos C57BL , Receptores de Superficie Celular/fisiología , Receptores del Factor de Crecimiento Derivado de Plaquetas , Linfocitos T/inmunología , Linfocitos T/metabolismo
13.
Blood ; 78(3): 688-99, 1991 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-1830499

RESUMEN

The present study examined the effects of the androgen steroid, dihydrotestosterone (DHT), on murine T-cell production of a number of lymphokines. Direct exposure of murine T cells to DHT in vitro was found to reduce the amount of interleukin-4 (IL-4), IL-5, and gamma-interferon (gamma IFN) produced after activation with anti-CD3 without affecting the production of IL-2. Exposure of T cells to either androstenedione or testosterone (the metabolic precursors of DHT) affected no change in the biosynthesis of either of these lymphokines. We have determined that macrophages possess 5 alpha-reductase, and are thus competent to metabolize testosterone to DHT. This physicochemical information is complemented by a functional analysis of macrophage metabolism of testosterone. By incubating bone marrow macrophages with testosterone, before their use as accessory cells, the IL-4 and IL-5 producing potential of the activated T cells cocultured with them was depressed. That the observed effect was mediated by the conversion of testosterone to DHT was further corroborated by illustrating that the inhibition of IL-4 production was abrogated if 4MA, a specific 5 alpha-reductase inhibitor, was added to macrophage cultures containing testosterone. The biologic role of DHT in lymphokine and immune response regulation in vivo was addressed using several lines of investigation. First, transdermal delivery of DHT to groups of mice altered the capacity of T cells residing in the draining lymph nodes, only, to produce lymphokines. Second, treatment of either aged mice or the T cells isolated from them with a combination of dehydroepiandrosterone and DHT restored the capacity of their T cells to produce IL-2, IL-4, and gamma IFN to levels equivalent to that of younger mice. Finally, we observed a difference between males and females of a given age to produce IL-2, IL-4, and gamma IFN, with both IL-4 and gamma IFN production being elevated in females. Collectively, our findings indicate that DHT, similar to other steroid hormones, may play an important role in lymphokine regulation in vivo.


Asunto(s)
Dihidrotestosterona/farmacología , Interferón gamma/biosíntesis , Interleucina-2/biosíntesis , Interleucina-4/biosíntesis , Interleucina-5/biosíntesis , Activación de Linfocitos , Linfocitos T/inmunología , Androstenodiona/farmacología , Animales , Anticuerpos Monoclonales , Antígenos de Diferenciación de Linfocitos T/análisis , Bioensayo , Médula Ósea/inmunología , Antígenos CD4/análisis , Antígenos CD8 , Células Cultivadas , Cruzamientos Genéticos , Deshidroepiandrosterona/farmacología , Femenino , Cinética , Macrófagos/inmunología , Masculino , Ratones , Ratones Endogámicos C3H , Ratones Endogámicos , Receptores de Antígenos de Linfocitos T/análisis , Subgrupos de Linfocitos T/efectos de los fármacos , Subgrupos de Linfocitos T/inmunología , Linfocitos T/efectos de los fármacos , Testosterona/farmacología
17.
J Exp Med ; 171(4): 979-96, 1990 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-2139106

RESUMEN

We investigated the capacity of murine T lymphocytes, isolated from various lymphoid organs of normal or antigen-primed donors, to produce IL-2 or IL-4 after activation with anti-CD3 or specific antigen. Our results established that T cells resident within lymphoid organs being drained by nonmucosal tissue sites (e.g., axillary, inguinal, brachial lymph nodes, or spleen) produced IL-2 as the predominant T cell growth factor (TCGF) after activation. Conversely, activated T cells from lymphoid organs being drained by mucosal tissues (Peyer's patches, and cervical, periaortic, and parathymic lymph nodes) produced IL-4 as the major species of TCGF. Analysis of the lymphoid tissues obtained from adoptive recipients of antigen-primed lymphocytes provided by syngeneic donors provided evidence that direct influences were being exerted on T cells during their residence within defined lymphoid compartments. These lymphoid tissue influences appeared to be responsible for altering the potential of resident T cells to produce distinct species of TCGF. Steroid hormones, known transcriptional enhancers and repressors of specific cellular genes, were implicated in the controlling mechanisms over TCGF production. Glucocorticoids (GCs) were found to exert a systemic effect on all recirculating T cells, evidenced by a marked dominance in IL-4 production by T cells obtained from all lymphoid organs of GC-treated mice, or after a direct exposure of normal lymphoid cells to GCs in vitro before cellular activation with T cell mitogens. Further, the androgen steroid DHEA appeared to be responsible for providing an epigenetic influence to T cells trafficking through peripheral lymphoid organs. This steroid influence resulted in an enhanced potential for IL-2 secretion after activation. Anatomic compartmentalization of the DHEA-facilitated influence appears to be mediated by differential levels of DHEA-sulfatase in lymphoid tissues. DHEA-sulfatase is an enzyme capable of converting DHEA-sulfate (inactive) to the active hormone DHEA. We find very high activities of this enzyme isolated in murine macrophages. The implications of our findings to immunobiology are very great, and indicate that T cells, while clonally restricted for antigen peptide recognition, also appear to exhibit an extreme flexibility with regards to the species of lymphokines they produce after activation. Regulation of this highly conservative mechanism appears to be partially, if not exclusively, controlled by cellular influences being exerted by distinct species of steroid hormones, supplied in an endocrine or a paracrine manner where they mediate either systemic or tissue-localized influences, respectively.(ABSTRACT TRUNCATED AT 400 WORDS)


Asunto(s)
Interleucina-2/biosíntesis , Interleucina-4/biosíntesis , Tejido Linfoide/inmunología , Linfocitos T Colaboradores-Inductores/inmunología , Animales , Anticuerpos Monoclonales , Arilsulfatasas/metabolismo , Células Cultivadas , Inmunización Pasiva , Ganglios Linfáticos/inmunología , Activación de Linfocitos , Tejido Linfoide/enzimología , Ratones , Ratones Endogámicos C3H , Ratones Endogámicos , Ganglios Linfáticos Agregados/inmunología , Bazo/inmunología , Esteril-Sulfatasa
18.
Oral Surg Oral Med Oral Pathol ; 69(1): 45-7, 1990 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-2136946

RESUMEN

Dental personnel in London were surveyed for their uptake of hepatitis B vaccine and willingness to provide dental care to carriers of hepatitis B virus (HBV). Most respondents were aware of current recommendations about vaccination, and three fourths of dentists had been vaccinated against HBV. However, only half of dental ancillary staff members had been vaccinated against HBV. Three fourths of the London dentists surveyed, despite their immunity against HBV, were unwilling to treat HBV carriers.


Asunto(s)
Actitud del Personal de Salud , Portador Sano , Atención Dental para la Persona con Discapacidad/estadística & datos numéricos , Personal de Odontología/psicología , Hepatitis B/prevención & control , Vacunación/estadística & datos numéricos , Vacunas contra Hepatitis Viral , Relaciones Dentista-Paciente , Odontología General , Humanos , Londres , Encuestas y Cuestionarios
19.
J Immunol ; 143(6): 1737-44, 1989 Sep 15.
Artículo en Inglés | MEDLINE | ID: mdl-2506268

RESUMEN

The exposure of experimental animals to the inflammatory effects of ultraviolet radiation (UVR) is known to cause depressions in their ability to initiate and effectuate various types of cellular immune responses. Contact-type and delayed-type hypersensitivity, plus the ability to generate protective forms of anti-viral and anti-tumor immunity, are all affected by the prior exposure of normal animals to the effects of this physical agent. Presently, the cellular and molecular mechanism(s) responsible for mediating the changes in immune function observed in UVR-exposed animals is not fully understood. Herein we report that one reproducible consequence of exposing normal mice to low doses of UVR is a dramatic change in the pattern of lymphokines secreted by their activated T cells. Lymphocytes isolated from UVR-exposed donors produce/secrete greatly reduced levels of the T cell lymphokines IL-2 and IFN-gamma activation in vitro with protein Ag of the polyclonal T cell stimulant anti-CD3. The secretion of IL-4 by these lymphocyte cultures, however, is consistently elevated in comparison to normal controls. Further studies determined that a similar change in lymphokine production was induced when mice were treated with either bacterial LPS or rIL-1 beta, a cytokine known to be elevated in vivo after UVR or LPS exposure. The ability of IL-1 to facilitate a change in the capacity of T lymphocytes to produce/secrete lymphokines after in vitro activation does not appear to represent a direct effect of this cytokine on lymphocyte or accessory cell targets because addition of IL-1 beta to cultures of Ag-primed lymphocytes obtained from normal donors was incapable of altering the pattern of lymphokine production. Collectively, our present results add further support to the hypothesis that UVR-induced elevations in endogenous IL-1 are, in part, responsible for the immunomodulatory effects of UVR. These findings provide compelling evidence that UVR, plus other agents capable of endogenously stimulating the production of IL-1, may function to alter the expression of different effector mechanisms in vivo. This could be facilitated through selective reductions in lymphokines produced by Th-1-type cells (IL-2 and IFN-gamma) and a simultaneous augmentation in a lymphokine produced by Th-2-type cells (IL-4).


Asunto(s)
Interleucina-1/fisiología , Interleucina-2/biosíntesis , Interleucinas/biosíntesis , Linfocitos T/efectos de la radiación , Animales , Inmunidad Celular/efectos de la radiación , Interferón gamma/biosíntesis , Interleucina-1/administración & dosificación , Interleucina-4 , Cinética , Lipopolisacáridos/farmacología , Activación de Linfocitos/efectos de la radiación , Ratones , Ratones Endogámicos C3H , Linfocitos T/metabolismo , Rayos Ultravioleta
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